Definition df-9 7161

Description: Define the number 9.

Assertion

Ref	Expression
df-9	|- 9 = (8 + 1)

Detailed syntax breakdown of Definition df-9

Step	Hyp	Ref	Expression
1		c9 7152	. 2 class 9
2		c8 7151	. . 3 class 8
3		c1 6387	. . 3 class 1
4		caddc 6389	. . 3 class +
5	2, 3, 4	co 4884	. 2 class (8 + 1)
6	1, 5	wceq 1298	1 wff 9 = (8 + 1)

This definition is referenced by:  9re 7171  9pos 7181  5p4e9 7198  6p3e9 7201  7p2e9 7203  8p2e10 7205  cos2bnd 8741

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